Study on ecological compensation ability of urban green space is the premise and foundation of scientific and reasonable urban ecological green space system planning. Taking Jinan as an example, the paper studies the ecological compensation ability of ecological green space system by applying RS and GIS technology, based on the principle of balance of carbon and oxygen and by using the green equivalent method. The results show: except Lixia District’s per-capita two-dimensional green biomass does not reach minimal standard(25m2 per person), the other four districts (Licheng, Tianqiao, Huaiyin and Shizhong) reach the underline of green equivalent which meets the needs of the normal life of residents. However, there exist some problems, such as scarcity of green space types and disproportion of ratio between trees and shrubs.
The study on the wetland plant species and their resistance is the key to ecological wastewater treatment technology. The study on the effects of wastewater duress on the physical and chemical properties of constructed wetland plants and the anti-stress capability of constructed wetland plants can provide theoretical basis and technical support for constructed wetland plant material selection. By adopting surface flow constructed wetland system, the effects are studied on MDA in 4 common plants in Shandong (Phragmites communis, Typha oriental, Arundo donax and Canna generalis) in different wastewater duress time. The results show: All in all, Phragmites communis and Canna generalis have stronger anti-stress capability, while Arundo donax and Typha oriental has weaker anti-stress capability; but as wastewater duress time increases, the anti-stress capability of Phragmites communis decreases, while the anti-stress capability of Canna generalis increases.
The research on the species selection of constructed wetland plants and the purification effects of the plants is crucial in ecological wastewater treatment technology. This paper studies the purification effects of different residence time of sewage water, different constructed wetland plants and their synergistic effect on COD disposal in domestic sewage. The results indicate that the best plant combination in purifying COD is that of Phragmites communis, Typha orientalis and Canna generalis, followed by that of Phragmites communis, Arundo donax and Canna generalis. The best plant species in purifying COD is Typha orientalis, followed by Phragmites communis.
The research which is the species selection of constructed wetland plants and the resistance of the plants is the key to ecological wastewater treatment technology. This paper studies the change of chlorophyll content in 4 wetland plants (Phragmites communis, Typha orientalis, Arundo donax and Canna generalis) in different wastewater duress time. The results show: chlorophyll contents in Canna generalis and Arundo donax have less change, and their anti-stress capability are stronger.
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